HBM C2 Series Manuel utilisateur

Force transducer

Mounting Instructions

Electrical

measurement

of mechanical

quantities

HBM Mess- und Systemtechnik GmbH

B 20.C2.10 e

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Content Page

Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Scope of supply 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Applicationnotes 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Structure and mode of operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Measuring body 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Disturbance variables and their compensation 8. . . . . . . . . . . . . . . . . .

4 Conditionson site 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Ambient temperature 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Moisture 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Air pressure 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Chemical effects 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Mechanicalinstallation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Important measures for installation 10. . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 General installation guidelines 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 Mounting accessories 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Electrical connection 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Instructions for cabling 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 Wiring pin assignment 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Specifications 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Dimensions 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 Declaration of conformity 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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4C2

Safety instructions

Use in accordance with the regulations

Force transducers of the C2 type are designed for force measurements in test

rigs/presses/test devices/testing machines. Use for any additional purpose

shall be deemed to be not in accordance with the regulations.

In the interests of safety, the transducer should only be operated as described

in the Mounting Instructions. It is also essential to observe the appropriate

legal and safety regulations for the application concerned during use. The

same applies to the use of accessories.

The transducer is not a safety element within the meaning of its use as

intended. Proper and safe operation of this transducer requires proper

transportation, correct storage, assembly and mounting and careful operation

and maintenance.

General dangers due to non–observance of the safety instructions

The C2 force transducer corresponds to the state of the art and is fail–safe.

The transducers can give rise to residual dangers if they are inappropriately

installed and operated by untrained personnel.

Everyone involved with the installation, commissioning, maintenance or repair

of a force transducer must have read and understood the Mounting

Instructions and in particular the technical safety instructions.

Residual dangers

The scope of supply and performance of the transducer covers only a small

area of force measurement technique. In addition, equipment planners,

installers and operators should plan, implement and respond to the safety

engineering considerations of force measurement technique in such a way as

to minimise residual dangers. Prevailing regulations must be complied with at

all times. There must be reference to the residual dangers connected with

force measurement technique.

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In these mounting instructions residual dangers are pointed out using the

following symbols:

Symbol: DANGER

Meaning: Highest level of danger

Warns of a directly dangerous situation in which failure to comply with safety

requirements will lead to death or serious physical injury.

Symbol: WARNING

Meaning: Possibly dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements can lead to death or serious physical injury.

Symbol: ATTENTION

Meaning: Possibly dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements could lead to damage to property, slight or moderate

physical injury.

Symbol: NOTE

Refers to the fact that important information is being given about the product

or its use.

Symbol:

Meaning: CE mark

The CE mark signals a guarantee by the manufacturer that his product meets

the requirements of the relevant EC directives (see Declaration of conformity

at the end of this document).

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6C2

Prohibition of own conversions and modifications

The transducer must not be modified from the design or safety engineering

point of view except with our express agreement. Any modification shall

exclude all liability on our part for any damage resulting therefrom.

Qualified personnel

These transducers are only to be installed by qualified personnel strictly in

accordance with the specifications and with the safety rules and regulations

which follow. It is also essential to observe the appropriate legal and safety

regulations for the application concerned. The same applies to the use of

accessories.

Qualified personnel means persons entrusted with the installation, fitting,

commissioning and operation of the product who possess the appropriate

qualifications for their function.

Conditions on site

Protect the transducer from damp and weather influences such as rain, snow,

etc.

Maintenance

The C2 force transducer is maintenance free.

Accident prevention

Although the specified nominal force in the destructive range is several times

the full scale value, the relevant accident prevention regulations from the

trade associations must be taken into consideration.

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1 Scope of supply

•C2 force transducer

•C2 Operating Manual

Accessories (not included in the scope of supply)

•EPO3/EPO3R thrust piece mounting accessory

for 500N...10kN: Order no. 1–EPO3/200KG

20kN, 50kN: Order no. 1–EPO3R/5t

100kN, 200kN: Order no. 1–EPO3R/20t

500kN: Order no. 1–EPO3/50t

Options

•Operating temperature range extended to 120 oC

•Degree of protection IP68

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8C2

2 Application notes

Force transducers of the C2 type series are suitable for the measurement of

compressive forces. They provide extremely accurate measurements of static

and dynamic forces and must therefore be handled carefully. You must be

particularly vigilant when transporting and installing the devices. If the

transducers are dropped or jolted, permanent damage could be caused.

The limits for the permissible mechanical, thermal and electrical stresses are

stated in the Specifications. Be sure to allow for them when planning the

measuring setup, when installing and lastly, when operating.

3 Structure and mode of operation

3.1 Measuring body

The measuring element is a measuring spring made from stainless steel, to

which strain gauges (S/G) are applied. The measuring element is

simultaneously the top part of the transducer housing. The strain gauges are

arranged so that four of them are extended and the other four are upset when

a force acts on the transducer. Correction and compensation resistors are

placed in the transducer circuit in order to remove unwanted influences on the

zero signal and sensitivity.

3.2 Disturbance variables and their compensation

Torsion, bending and transverse load are disturbance variables and are

therefore to be avoided. If necessary they can be remedied with HBM

mounting accessories (section 5.3 ). In addition to this, the C2 has

independent lateral force compensation, which reduces the effects of

transverse forces to a minimum (See Specifications).

The effects of temperature on the zero signal and on the sensitivity are

compensated.

Changes in the ambient pressure act as additive/subtractive forces.

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4 Conditions on site

4.1 Ambient temperature

To achieve optimal measurement results the nominal temperature range must

be maintained. Constant but slowly changing temperatures are best.

Measurement errors caused by temperature arise if one side is heated (for

example, radiant heat) or cooled. A radiation shield and all–round heat

insulation bring about marked improvements. They must not form a force

shunt.

4.2 Moisture

Extreme humidity or a tropical climate should be avoided, if outside the

classified limit values (degree of protection IP67 under DIN EN 60529).

NOTE

Moisture must not be allowed to penetrate the free end of the

connection cable.

4.3 Air pressure

Changes in air pressure affect the force transducer in the same way as a

change in force. The ambient pressure should be 0 –5 bar. Please note that

pressure variance will displace the zero point:

Nominal load 500N 1kN 2kN 5kN 10kN 20kN 50kN 100kN 200 kN

max. zero drift

[%/10 mbar] 0.065 0.032 0.016 0.006 0.003 0.006 0.003 0.002 0.001

4.4 Chemical effects

Dust, dirt and other foreign bodies must not be allowed to accumulate such

that they divert part of the measured force onto the housing and so falsify the

measured value (force shunt).

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10 C2

5 Mechanical installation

5.1 Important measures for installation

•Treat the transducer gently

•Do not overload the transducer.

•During or immediately after installation, the transducer should be bridged

by a stranded copper wire 50mm2(highly flexible signal ground cable EEK

from the HBM line). The cable is screwed on both above and below the

transducer. This prevents welding currents from flowing through the

transducer and welding the force introduction point.

WARNING

If there is a risk of breakage through overload on the

transducer and thus a risk to persons, additional safety

measures are to be taken.

5.2 General installation guidelines

The measurement direction in which forces act on the transducer must be as

precise as possible.

WARNING

Torsion and bending moments, eccentric loading and

transverse forces result in measurement errors and if limit

values are exceeded, could destroy the transducer.

HBM supplies the EPO3 thrust piece as a mounting accessory for transducers

of the C2 type series. This mounting accessory stops torsion and bending

moments and prevents transverse or oblique loads being introduced into the

transducers.

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